Apparatus for constructing plaster wall board



' June 25, 1929.

C. R. BIRDSEY APPARATUS FOR CONSTBITJTINGPIIASTER WALLBOARD 2}}. 1922 4Sheets-Sheet 1 Filedjugf INVENTOR. Charles I? Birds:

A TTORNE Y.

JEhe' 25, 1929. R, BIRDSEY 1,718,890

APPARATUS FOR CONSTRUCTING PLASTER WALLBOAHD Filed Aug. 25. 1922 4Sheets-Sheet 2 III N fi

' INVENTOR.

Charles R. Birds A TTORNE Y.

June 25, 1929. Q BlRDsEY 1,718,890

APPARATUS FOR CONSTRUCI'ING PLASTER WALLBOARD Filed Aug. 23. 1922 i 4Sheets-Sheet 3 INVENTOR.

& 3 I Cirar/es E Bir'as r By MJM ATTORNEY.

June 25, 1929. C BIRDSEY 1,718,890

APPARATUS FOR CONSTRUGTING PLASIER WALLBOARD Filed Aug. 23. 1922 4Sheets-Sheet 4 INVENTOR. Char/es 6. Birds A TTORN E Y.

Patented June 25,

UNITED STATES PATENT OFF! CHARLES R. BIBDSE Y, HINSDALE, ILLINOIS,ASSIGNOB TO UNITED STATES GYP- SUM COMPANY, OF CHICAGO, ILLINOIS, ACORPORATION 01' ILLINOIS.

APIQARATUS FOR CONSTRUCTING PLASTEB WALL BOABD.

Application filed August 28, 1922. Serial No. $83.79!.

This invention relates 'to improvements in the production of buildingmaterials and in particular to an apparatus and method of constructing.wall board, particularly designed to construct the plaster wallboardsdescribed in my Patent N 0. 1,428,624 of September 12, 1922, and whichwith but slight changes and without departing from the originalinvention is adapted to producing the in plaster wallboard as disclosedin my prior -Patent N 0. 1,406,967 of February 21, 1922.

Since it is old in the art to produce plaster wall board of this generalcharacter on a continuously operating apparatus which usually includes acontinuous belt conveyor extending from the wet end, or board formingportion, a distance to allow the plaster material to partially set andbond to the fibrous covering so that at the end of the conveyor thestrip of plaster board so formed may be cut in uniform lengths, removedand transferred to the drying kilns, it is only necessar to illustrateandv describe in this application, the particular construction of theboard forming mechanism at the wet end of the apparatus.

While the preferred forms of apparatus for carrying out the methoddescribed herein are illustrated upon the accompanyin sheets ofdrawings, yetit is to be understoo that minor detail changes may be madetherein without departing from the scope of the invention.

In the drawings: 7

Figure 1 is a view partly inside elevation and partly in lon itudinal'vertical section through the board orming apparatus, as contemplated inthis invention.

Figure 2 is a top plan view of the Figure 1 with parts broken away andremoved.

Figures 3, 4 and 5 are transverse sectional views taken on the lines3-3, 4-4 and 5-5 respectively of Figure 1.

Figure 6 is a detail top plan view and Figure 7 is a detail view in sideelevation and partly in section of a portion of the construction shownin Figures 2 and 1, respectively.

Figure 8 is a view in transverse section on the hue 8-8 of Figure 4.

Fi ure 9 is a perspective view of the wall boar shown in view on Figure8.

Figures 10 and 11 are views similar to Figures 8 and 7, respectively,illustrating another modified form of that apparatus to produce aslightly modified form of plaster wallboard.

Figure 12 is a diagrammatical enlarged perspective view illustrating themode of application of the sealing strip on the type of wallboardproduced by the apparatus illustrated in Figures 10 and 11.

Figure 13 is a view similar to Figure 12 illustrating a slightlymodified apparatus for applying the sealing strip above the flat surfaceof the wallboard.

The ap aratus illustrated by the first eight figures o the drawings isdesigned to produce the wallboard disclosed in my said Patent N 0.1,428,624 and shown in perspective in Figure 4 of this patent, fromwhich it is seen that a single cover sheet of fibrous material isemployed to embrace the plaster core or body of the board by folding themargins at both sides of the cover sheet about the longitudinal edges ofthe board and bringing the folded portions together butnot inoverlapping re ation upon the opposite surface ofthe plaster body, theedge portions of said sheet being secured together by a sealing or sheet3 of fibrous material from a roll 4 supported preferably below the tableon an extension thereof. This cover sheet is of sufficient width sothat'when the side margins are folded over-the laster body of thecompleted board the on itudinal edges will overla each other. e coversheet is advance from its roll to the conveyor on the table and beforepassing to the table the sheet preferably passes beneath two scoringdevices 5 which produce lines of reduced thickness in the sheet parallelto each other, which lines are arranged in pairs the distance betweeneach pair of lines being equal to the thickness of the completed boardand the distance between the innermost lines of the two pairs bein equalto the width of the completed board.

hese scoring devices are so arranged that the margins '6 and 7 along thelongitudinal edges outside the scored ines will overlap at the edgeswhen folded about the completed board. As the cover sheet advances onthe conveyor the margins are engaged by pick up and folding members 8arranged on each side of the table which are adapted to engage the p the.folde 'tudinal edges of the board under side of the margins andgradually bend them upward to a perpendicular osition along theinnermost scored lines as s own in Fi res 3 4 and 5. It is preferable toprovi d a holding roller 9 on the upper side of the central portion '10of cover sheet between the innermost scored lines slightly beyond thepoint where the pick up and folding members engage the margins to insurethe bending of the margin along these scored'lines and also insure thecentral portion of the sheet contacting with the conveyor.

It is preferable to deposit the plaster body of theboard upon thecentral portion of the cover sheet approximately at the point where themargins are caused to assume the perpendicular position by the pick upand folders as illustrated in Figure 5. The plaster body 11, preferablyof calcined gypsum, with or without aggregates, is deposited in plasticvstate preferably from a belt conveyor 12 as illustrated. Beyond thispoint the pick ups and folders impart a bend to each margin of thecoversheet along the outermost scored lines on each side, as illustratedin'Figure 6, and then bring these margins downward upon the uppersurface of the plastic mass as shown in Figure 2. The longitudinal edgesof the covering sheet abut each other, and are'secured together by ajoining strip 20. The advancing of the plastic body completely embracedby the folded cover sheet then causes the partially formed board to passbeneath a forming or pressure roll 13, which is of the same width as thecompleted board and which imparts to the partially formed board thedesired thickness of the completed board? To insure rectangular squarededges the completed product it is preferable to provide vertical belts14 on each side of the forming roll passing over vertical pulleys 15contactin with the longibeing formed. After leaving the forming roll 13the board passes on to a conveyor 16 of great length as previouslydescribed and only partially illustrated in these drawings. If desired,the vertical edge engagin belts 14 may be continued a distance along tis second conveyor.

The sealing or joinin strip 20 is supplied from a roll 21 mounte abovethe partially formed board which strip is led between the pick up andfolding members 8 and applied to the upper surface of the plastic body11,

so that as-it passes under the forming roll 13 it will en a e*theunderside of the edges of narily the forming (roll will exert enou hpressure to cause sufiicient of the plastic b0 y to enter between uppersurface "of the strip of the edges of the margins to bond the edges tothe strip in the completed board. However, if desired, silicate of sodaor other bonding substances may be applied tothe upper surface of thestrip before the margins are own margins 6 and 7. Ordi folded over it,as shown by the device 22 in Fi re 1, to insure the complete sealing.

s shown in Figure 9 the longitudinal edges of the folded over marginsmeet at the longitudinal center of the board and are secured 'to eachother on the underside by the sealing strip between them which isdepressed into the body of the board and presents a flat surface on thatside of the completed board.

' When desired to apply the sealing strip on the exterior of the board,as shown in Fig. 3 of my said patent No. 1,428,624, it is on necessaryto apply this sealing strip after'margins of the cover sheets have beenbrought together and, as shown in Figures 10, 11 and 12, the strip 20may be applied by passing it over the board forming pressure roll 13. Inthis case, it is preferable to apply silicate of soda or other'bondingsolution to the underside of the sealing strip before it is passed abovethe pressure roll.

As seen in Figure 12, the sealing strip 20 a plied in this manner willdepress the edges of the folded over margin into the plastic body 11 andas the pressure forming roll is cylindrical throughout, the surface ofthe finished board on the side of the sealing strip will be completelyflat.

If it is desired to apply sealing strip 20 without depressing the edgesof the overla ped margins, as shown in Fig. 2 of my said patent, thatportion of the pressure forming roll over which the sealing strip passesmay be provided with an indentation 23 equaling in width and depth thewidth and depth of the sealing strip as shown in Figure 13.

What I claim is:

1. An apparatus for constructing plasterboard comprising means foradvancing a fibrous cover sheet of sufficient width to completelyembrace the finished board, means for folding up the margins of saidcover sheet, means for depositing plaster body in a plastic mass uponthe cover sheet, means to fold down the u turned mar n upon the lasticmass with t e edges of t e margins a jacent one of the other, means forapplying a sealing strip of fibrous material covering the adjacent edgesof the margins, and board forming means, including a pressure roll arraned to apply the folded over margins on the astic mass and cover theadjacent edges wit the sealirlg strip. 2. n apparatus for constructingplasterboard, comprising means for advancing a fibrous cover sheet ofsuflicient width to completely embrace the finished board, means forfolding up the margins of said cover sheet, means for depositing theplaster body in a plastic mass upon the cover sheet, means to fold downthe upturned margins upon the plastic mass with the edges of the marginsadjacent one to the other, means for applying a sealing strip of fibrousmaterial adapted to cover the adjacent edges of the margins upon theplaster body after the folding down of said margins, and board formingmeans including a pressure roll arranged to apply the folded overmargins upon the plastic mass to cover the adjacent edges with thesealing strip.

3. Apparatus for constructing plasterboard comprising means foradvancing a fibrous cover sheet of sufficient width to completelyembrace the finished board, means for folding up the margins of saidcover sheet, means for depositing the plaster body in a plastic massupon the cover sheet, means to fold down the upturned margins upon theplastic mass with the edges of the margins adjacent one to the other,means for applying a sealing strip of fibrous material covering theadjacent edges of the margins, means for providing adhesive between thecover strip and the portions of the margin covered there- 7 by, andboard forming means including a pressure roll arranged to apply thefolded over margin upon the plastic mass, and cover the adjacent edgeswith the sealing strip.

4. An apparatus for constructing plasterboard, comprising means foradvancing a fibrous cover sheet of sufficient width to completelyembrace the finished board, means for folding up the margins of saidcover sheet, means for depositing the plaster body in a plastic massupon the cover sheet, means to fold down the upturned margins upon theplastic mass with the edges of the margins adjacent one to the other,means for applying a sealing strip of fibrous material covering theadjacent edges of the margins, and a bord forming means includingpressure roll arranged to apply the folded over margins on the plasticmass to cover the adjacent edges with the sealing strip, and to pressthe strip in the plastic body so the board on that face, provides a fiatsurface.

5. An apparatus for constructing plasterboard, comprising means foradvancing a fibrous cover sheet of sufficient width to completelyembrace the finished board, means for folding up the margins of saidcover sheet, means for depositing the plaster body in a plastic massupon the cover sheet, means to fold down the upturned margin upon theplastic mass with the edges of the margins adjacent one to the other,means for applying a sealing strip of fibrous material covering theadjacent edges of the margins on the exterior thereof, and board formingmeans including a pressure roll arranged to apply the folded overmargins upon the plastic mass and cover the adjacent edges with thesealing strip.

6. An apparatus for constructing plasterboard, comprising means foradvancing a fibrous cover sheet of sufficient Width to completelyembrace the finished board, means for folding up the margins of saidcover sheet, means for depositing the plaster body in a plastic massupon the cover sheet, means to fold down the upturned margins upon theplastic mass with the edges of the margins adjacent one to the other,means for applying a sealing strip of fibrous material covering theadjacent edges of the margins of the exterior thereof, and board formingmeans, including a pressure roll arranged to apply the folded overmargins upon the plaster mass and cover the adjacent edges with thesealing strip, and to press the portions of the margins under thesealing strips so that the board on that side provides a flat surface.

CHARLES R. BIRDSEY.

crnrirlcma or CORRECTION. a

as." No. 1,718, 890.

Granted June 25, 1929, to

CHARLES R. BIRD SEY.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 1,line 49, for "Figure 4" read "Figure 7"; page}, line 114, claim 1; forthe word "of" read "to"; page 3, line 39, claim 4, for the misspelledvword "bord" read "'board"; and that the said Letters Patent should beread with these corrections therein that the same may conform to therecord of the case in the Patent Office.

Signed and sealed this 10th day of September, A. D. 1929.

'(Seal) M. J. Moore, Acting Comissioner of Patents.

